Cases of word usage

1) the central part of a stadium used for sport and games (arena)

2) (especially) to put, bring, (something, especially government) under central control (centralize)

3) central processing unit (cpu)

4) (an act of) forming a political union of several states for control of foreign affairs, defence etc by the central (Federal) government but keeping regional (State) government for other things such as education (federation)

5) metal goods for domestic use, e.g. pots and pans; mechanical equipment in a computer system e.g. the central processing unit, visual display unit etc (hardware)

6) a joint on which a lid, door or gate turns or swings; the central principle on which something depends (hinge)

7) the central part of a wheel from which the spokes radiate (hub)

8) a large spotted animal of the cat family, found in Central and South America (jaguar)

9) a stone at the top of an arch locking the others into position; the central principle on which an argument, idea etc depends (keystone)

10) the central part of a church where the people sit (nave)